Dry reforming of biogas in fluidized bed: Process intensification

Abstract

Available online xxxKeywords: Biogas Dry reforming Hydrogen Membranes Fluidized bed a b s t r a c t Biogas is a renewable resource obtained mainly from the anaerobic fermentation of agroindustrial and anthropogenic residues. The production of hydrogen by dry reforming of methane represents a potential application for this renewable energy carrier. This could play a positive contribution towards meeting the challenge of providing a global supply of energetically sustainable and environmentally friendly energy. This work combines a catalytic reaction, a separation and the catalyst regeneration in a single reactor. To this end, a two zone fluidized bed reactor (TZFBR) with hydrogen selective membranes has been employed (TZFBR þ MB). The operating conditions for the process of dry reforming of biogas have been optimized experimentally, both in TZFBR and TZFBR þ MB. Several catalysts were prepared (Ni/Al 2 O 3 , NieCe/Al 2 O 3 , NieCo/Al 2 O 3 ), characterized and tested in reactions in both TZFBR and in TZFBR þ MB. Finally, the influence of using oxygen or carbon dioxide as regenerating gases in the process has been studied. Experimental results show the feasibility of using CO 2 for in situ catalyst regeneration, avoiding the potential problems associated with the use of O 2 .ScienceDirect j o urn al h om epa ge: www.elsev ier.com/locate/he i n t e r n a t i o n a l j o u r n a l o f h y d r o g e n e n e r g y x x x ( 2 0 1 7 ) 1 e9 http://dx.

Kinetic Study of Dry Reforming of Methane Over Ni–Ce/Al2O3 Catalyst with Deactivation

“…This assumption agrees with the capability of coke removal by CO 2 at high temperatures [35][36][37]. These kinetic functions (ϕ d , ϕ r ) include the influence of operating conditions on catalyst deactivation.…”

Pure hydrogen from biogas: Intensified methane dry reforming in a two-zone fluidized bed reactor using permselective membranes

“…The reaction system, whose detailed scheme has been already shown elsewhere [24], is based in a quartz-made cylindrical reactor 2.8 cm in internal diameter and 30 cm in height. The arrangement of its different elements and streams is shown in Figure 1a.…”

“…The arrangement of its different elements and streams is shown in Figure 1a. A Ni(5 %)-Ce(10 %)/Al 2 O 3 catalyst was selected (all percentages in mass), among those used in the previous study [24], for this work. Nickel (5 %) provided a good catalytic activity to MDR and the addition of cerium (10 %) improved oxygen exchange and minimized coke formation.…”

“…Different processes of catalytic alkane dehydrogenation have been tested in TZFBR+MB reactors using several types of membrane, such as palladium membranes over ceramic hollow fiber or commercial membranes over a porous metallic support. Recently, the viability and stability of this process configuration has been analyzed for methane dry reforming [24]. It has been found that a TZFBR+MB system provides a much greater methane conversion than its counterpart without membranes, while offering the added advantage of operating in a steady mode.…”

Fabrication of Hierarchical Co/MgO Catalyst for Enhanced CO2 Reforming of CH4 in a Fluidized‐Bed Reactor

“…Compared with fixed‐bed reforming, reforming in the fluidized‐bed allows the catalyst to constantly circulate between the oxidizing region and the reducing region of the reactor . Carbon formed via CH 4 decomposition could be readily removed through CO 2 gasification under the oxidizing region …”